Sheet detector for printing presses and like machines



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I H. J. SCHULTZ SHEET DETECTOR FOR PRINTING PRESSES AND LIKE MACHINES Filed Feb. 14. 1920 3 sheets-sheet 5 I. w I

Patented Feb. 2, 1926.

QFFICE.

HERMAN 3'. SCHULTZ, OF CHICAGO, ILLINOIS.

SHEET DETECTOR FOR PRINTING PRESSES AND LIKE MACHINES.

Application filed. February 14, 1920. Serial No. 358,630.

To all 107mm it may concern:

Be it known that I, T-IERMAN J. SCHULTZ, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Sheet Detectors for Printing Presses and like Machines, of which the following is a specification.

This invention relates to improvements in sheet detectors for printing presses and like machines and refers more particularly to a device which may be easily attached to any type of printing press and provides means whereby sheets of paper or like material in advancing to the printing rolls are accurately positioned with relation thereto, being subjected to guiding mechanism that will act automatically in case of imperfections in the margin of the sheets or when the sheet of paper or like material is feeding into the machine in imperfect alignment, either by reason of the sheet being placed before or beyond the side guiding mechanism, where by the stopping action of the machine is actuated.

The construction of this device is an im provement over a similar attachment of a previous application, Serial No. 308,843, filed by me July 5, 1919.

In the drawings:

Fig. 1 is a fragmentary side elevation of part of a printing press, and automatic feeding mechanism showing the improved device applied thereto.

Fig. 2 is a plan view of part of the mechanism shown in Fig. 1, parts being omitted and other parts broken away for clearness.

Fig. 3 is an enlarged side elevation of the side guiding mechanism.

Fig, 4 is a diagrammaticside elevation of the marginal attachment showing the position when the device is contacting the edge of the paper.

Fig. 5 is a view similar to Fig. 1, but showing the contacting pin dropped from the margin of the paper.

Referring particularly to Fig. 1 of the drawings, the frame 1 has mounted thereon an automatic paper feeder 2, which is of the type used with a flat bed two revolution cylinder press and to which the device embodying the invention is applied, One of the printing cylinders is indicated at 3. The sheets of paper A are advanced successively over the sticks 5 and are subjected to the actionof the side guide mechanism 6. This side guide is of Well known type and com prises gripping shoes 7, pivotally mounted on an angle bar 8, which is pivoted at 9 to bracket arm 10 and has means for causing the shoes to engage the paper and adjust the paper sidewise of the machine. The bar is provided with a spring 11, one end of which is fixed at 12 to the hub 13 of the angle bar and has its other end secured to a nut 14- having threaded engagement with the pivot pin 15. The action of the spring 11 is to rock the angle bar on its pivot and cause the shoes to engage the margin of the paper sheet and hold it between the shoes and base plate 16 of the bracket 10.

The bracket 10 is adjustably secured at 17 to a clamp 18 mounted on the side guide operating shaft 19. The shaft 19 terminates in a rack extension 20 slidable in the bearing 21 in the standard 22. The side guide operating shaft is reciprocated by reason of the actuating of a segmental gear'23 on stub shaft 24 engaging the rack 20. This action is produced by the pull rod 25 secured to the outer end of the cross head 26. The vertical projection 8 of the angle bar 8 is shaped at 8 to receive the roller 27 on the arm 28 of a bell crank 29 pivoted at 30 to the bracket 10. A, depending arm 31 of the bell crank 29 iscaused to engage a lug 32 on the inward movement or movement toward the center of the shaft 19 thereby tripping the angle bar, and through the action of the spring 11, rocking the angle bar downward, bringing the shoes in contact with the margin of the paper and securedly holding the paper between the shoes 7 and the base plate 16 of the bracket 10. The spring 11 has just enough tension, when regulated, for heavy or light paper stock, so thatthe grippers merely shift the paper against the side lugs and then slip OK. If tension is too great, the paper will cramp and the stock be mutilated. The sheet of paper will be carried .sidewise when the shaft 19 moves transversely to the travel of the sheet by the mechanisms just described until the arm 31 of the bell crank engages the lug 33, this lug together with lug 32 being secured to a bed plate 34-, adjustably mounted on a bar secured to the table 2 of the automatic feed mechanism.

As shown in Fig. 3, the margin of the paper-atv is gripped between the jaws 7 and base plate 16, and while being so held is moved sideways until. the depending arm ill is tripped by the lug 33, causing the roller 27 to move down into the groove 8 which actuates the angle arm 8 upon its pivot. thereby releasing the paper from the jaws. A t the point of contact of the depending arm 31 with the lug 33 that is with the release of the paper from the jaws, the paper will have moved to point where the inargin thereof will be brought in contact with the side guide stops 36 and in proper position to be advanced through the printing press in the usual and well known manner.

Referring to the bed plate 34 it will be noted that the inner end thereof projects heneath the path of travel of the incoming sheets of paper. To this bed plate is fastened the holding plate 37 by means of screws 88. A laterally extending member 39 fixed to the plate 37 by screws 42 furnishes a base for the standard 41 which is adjust-ably mounted thereon by means of the set screw 42 operatingin. the slot 43 of the member Two horizontally extending parts 11 and 41 of the standard 41 are bored to accommodate the vertical pin 24:. upon which is adjustably mounted the weight 4-5 by means of the set screw 46. This pin is limited in its vertical movement between the members 41* and 41 bv the top and bottom of the weight 45. The lower member 41* is'notched at 41 and the standard 41 so adjusted with reference to the guides. 36 that the margin of the paper will contact the inner vertical wall of the notch 41 at the same time that itcontacts the guides 36 so that the vertical pin will contact with the top surface of the paper when it is in proper alignment vith refe ence to the press. When contacting the top surface of the paper, the attachment will be held in a position shown in Fig. t at which time the rock lever 4:7,pivoted at 4-8 to the standard 4-1 and engaging the weight by cut away portion 45 is slightly reciprocated due to the action of the hooked link member 49.

This link member slides back and forth along the upper surfaceof the rock lever sift-held in. contact therewith by a spring "i9 and fastened at to the arm 51. This arm is fixed to a shaft 52 known as the kickoff shaft such asshown and described in U. S. patent to Cross 854078 wherein the kick-off shaft C of this Cross patent is the equivalent of kick-off shaft 52 as shown in the drawings of this application. The shaft 52 is rocked through the actuation of the pull rod 53 and its associated parts which are common to printing presses and form no part of this invention. All of the aforesaid mechanisms are assembled and operated in timed relation to each other. the vertical pin is contacting the top surface of the paper, as previously mentioned and shown iii-Fig. 4t, and the margin is in proper alignment, the hooked link member will ride over the recess 47* in the rock lever 47 due to the overriding plate 48 fixed to the standard 41.

In passing beneath the vertical pin 44:, should shes through improper alignmentfrom any cause or through failure of the side guides to perform their function, fail to come within the vertical place of action of the pin or should the margin of the materialbe mutilated, the pin will fail to be stopped by the paper and due to the weight 45. will drop into a hole bored directly beneath the pin and in doing so, will cause the weight to pull down the When rock lever so that the recess47 therein will be rocked above the overriding plate 48, at which time the hook linkwill engage the recess as shown in Fig. 5. ment of the hook link with the rock lever will arrest the rocking of the shaft 52 and in so doing will cause, through a series of connections and mechanisms (not shown), a. stoppage of the entire press mechanism. Inthis manner, the device automatically stops the machine when the paper is not feeding properly into the press.

The attachment maybe mounted on either or both margins of the paper by merely reversing the arrangement of the mechanism.

I claim as my invention:

1. In a sheet detector for printing presses and like machines having means for feeding sheets into the press and means for laterally guiding said sheets, the combination of a means operating in conjunction with the lateral guide means comprising a vertical contacting pin and rocker arm adapted to extend over the margin of the sheets. means whereby the arm is caused to vibrate and the pin to continuously contact the sheets as the latter advance on the press whereby a failure of contact between the pin and the sheet will cause a stoppage of the press or machine.

2. In a sheet detector .for printing presses and like machines, havling an automatic stopping mechanism,,of a cont-acting mechanism comprising a vertical contacting. pin actuated by a pivoted lever, said contacting mechanism mounted adjacent to either margin of the sheets being fed to the press, operative connections between the pivoted lever and an oscillating shaft of the press adapted to actuate the pivoted lever and on failure of the pin to contact the material,

This engageto automatically work the pressure stopping mechanism.

3. In a sheet detector for printing presses and like machines, the combination with a )ress havin an automatic sto in mechanism, of a contacting mechanism comprising a contacting pm actuated by a pivoted lever from the press and adapted to lntermittently contact a lateral edge of the material, operative connections between the pivoted lever and the automatic stopping mechanism whereby on faulty alinement of the sheet and failure of the pin to contact the material, the press is automatically stopped.

HERMAN J. SCHULTZ. 

